JP6651878B2 - Vacuum valve - Google Patents

Description

  The present invention relates to a vacuum valve used for a vacuum circuit breaker and the like, which opens and closes an electric circuit, and more particularly to a vacuum valve which can efficiently diffuse an arc generated when the electric circuit is opened and closed.

  The vacuum valve is a bottomed cylindrical vacuum vessel made of an insulating material such as glass material or ceramic material and evacuated to a high vacuum, electrode rods provided at both ends of the vacuum vessel, and each electrode rod. A spiral-shaped coil electrode provided at the opposite end of the coil, a support member for reinforcing the contact, and a disk-shaped contact. By moving one of the electrode rods in the axial direction, both contacts (ie, The energization or interruption is performed by contacting or separating the fixed contact and the movable contact.

  Here, the coil electrode is an electrode that generates an axial magnetic field around the fixed-side contact and the movable-side contact, which are the main electrodes. Are arranged separately. One end of the coil portion has an arm portion connected to the center of the shaft, and the other end has a protrusion connected to a contact.

  In a vacuum valve having a coil electrode as described above, the coil electrode generates an axial magnetic field when energized, and diffuses widely across the contact surface while confining the arc between the contacts, which is inevitably generated at the time of interruption, within the diameter of the contact. Let it. As a result, the current density can be reduced with respect to the contact surface, and the breaking ability of the contact material is superior, so that the current can be cut off.

  In order to further increase the breaking capacity of a vacuum valve, the development of this coil electrode and contact material is indispensable, and various studies have been made so far. It has been found that the stronger and uniform the axial magnetic field to be generated and the larger the area, the better.

JP-A-6-150786 JP-A-1-117217

  As described in Patent Documents 1 and 2, a vacuum valve of a type in which an arc generated between contacts is diffused widely by a magnetic field to improve a breaking performance is a method in which currents to be supplied are two coils on a fixed side and a movable side. It flows through the electrodes and generates an axial magnetic field between the coil electrodes.

  For example, as shown in Patent Literature 1, an electric current flowing through a fixed-side electrode rod via a fixed-side electrode rod is an arm portion connected from the fixed-side electrode rod to a circular fixed-side coil electrode, and a coil divided into an arc shape. Through the protruding portion that connects from the coil portion to the contact, and flows to the fixed contact. Furthermore, it flows from the fixed side contact to the movable side contact, and flows to the movable side electrode rod via the protruding part, the coil part, and the arm part of the movable side coil electrode.

  At this time, the magnetic field generated in the coil unit acts in a direction in which the magnetic fields generated from each other are strengthened by connecting and arranging the fixed side and the movable side coil units so that current flows in the same direction. However, current flows in the outer circumferential direction in the arm portion of the fixed coil electrode, and flows in the direction of the electrode rod in the arm portion of the movable coil electrode. Therefore, in the arm portion, the directions of the currents are opposite to each other. Cancel each other out. In addition, in the respective projecting portions of the fixed-side and movable-side coil portions, current does not flow in the circumferential direction as in the coil portion, but flows in the axial direction of the electrode rod. No directional magnetic field is produced.

  As described above, the magnetic field generated in both the fixed-side coil portion and the movable-side coil portion in the coil portion reinforces each other, and a strong magnetic field in the axial direction is generated, but the magnetic field is weakened or canceled out in the protruding portion and the arm portion, No magnetic field is created to diffuse the axial arc, and the magnetic field around both electrodes is non-uniform.

  In order to equalize the magnetic field around the fixed coil electrode and the movable coil electrode, a magnetic material is placed on the back surface of each electrode to compensate for the weak magnetic field between the electrodes, so that the axial direction generated between the electrodes It is known that the magnetic field can be made uniform and the blocking performance is improved. However, when a magnetic material is placed inside the electrode, electromagnetic induction occurs due to magnetic flux passing through the inside of the magnetic material. As a result, an eddy current is generated, and the temperature rises due to the heat generated by the eddy current when a load current is supplied, resulting in a high reliability. There is a problem that the performance is reduced.

  When the magnetic material is arranged outside the vacuum vessel of the vacuum valve, no eddy current is generated due to the shielding effect of the vacuum vessel, heat generation is prevented, and reliability can be improved. At the same time, it is possible to increase the axial magnetic field generated between the fixed coil electrode and the movable coil electrode. However, in this arrangement, the magnetic material affects a wide range, so the weak magnetic field found in the arm and protruding parts of both electrodes is compensated, and the non-uniformity of the magnetic field generated between the electrodes is improved. I can't.

  As described above, by arranging the magnetic material, the magnetic field can be strengthened and the blocking performance can be improved, but the magnetic field cannot be made uniform. For this reason, there has been a problem that the arc cannot be sufficiently diffused, and the electrode cannot be reduced in size and cost.

  In addition, for example, in the example disclosed in Patent Document 2, attention is paid to the fact that the terminal lead-out cover of the circuit breaker arranged on the meta-clutch or the like has a U-shape, and over a 3/4 of the entire outer circumference of the shield. Although a magnetic material is arranged, the terminal extraction bar may not always be U-shaped, such as a vacuum valve built in C-GIS. In such a case, the magnetic field may be unevenly formed. It was not possible to expect an improvement in the breaking performance just by doing.

  The present invention has been made to solve such a problem, and can make the magnetic field in the axial direction uniform and can make the magnetic field strong. Further, there is no influence of temperature rise due to heat generated by eddy current generated in the magnetic material. Therefore, the present invention provides a vacuum valve that is small and has excellent shutoff performance.

A vacuum valve according to the present invention includes a vacuum vessel that covers one end of a cylindrical insulating cylinder with a fixed end plate and the other end with a movable end plate, and a fixed side fixed to the fixed end plate. The electrode rod, the movable electrode rod provided to be movable back and forth on the movable end plate, the fixed electrode and the movable electrode attached to the opposite ends of the fixed electrode rod and the movable electrode rod, respectively. An inner side and an arc shield arranged around the fixed side electrode and the movable side electrode, wherein the fixed side electrode and the movable side electrode are opposed to each other, and the fixed side contact and the movable side contact, and the fixed side contact and the movable side A fixed-side coil electrode and a movable-side coil electrode that are arranged on the back of the contact and allow current to flow in a circumferential direction orthogonal to the axis of the electrode rod when current flows between the fixed-side electrode rod and the movable-side electrode rod. Each has a fixed side coil electrode and a movable side coil electrode located at the center and fixed The fixed side ring portion and the movable side ring portion which are respectively connected to the electrode bar and the movable side electrode bar, and the fixed side ring portion and the movable side ring portion are located in a plane orthogonal to the axis of the fixed side slit portion and the movable side, respectively. The concentric fixed-side coil part, the movable-side coil part, and the fixed-side ring part, which are divided into a plurality of parts in the circumferential direction by the slit part, extend from the fixed-side ring part, the movable-side ring part in a direction orthogonal to the axis, and the fixed-side ring part. A vacuum valve having one end of a fixed-side coil portion, a plurality of fixed-side arm portions connecting a movable-side ring portion and one end of a movable-side coil portion, and a movable-side arm portion. A magnetic material is provided between the arc shield and the vacuum vessel corresponding to each of the plurality of divided positions in the circumferential direction of the side coil electrode, and the magnetic material flows to the fixed side coil electrode and the movable side coil electrode. Axis generated by electric current Compensates the magnetic field in the linear direction, and arranges so that the amount of correction for the magnetic field at positions divided into a plurality of parts in the circumferential direction, which is a part that is less likely to generate a magnetic field, than the fixed side coil part and the movable side coil part, is larger. A vacuum valve characterized by being performed .

  ADVANTAGE OF THE INVENTION According to the vacuum valve of this invention, the magnetic field of the axial direction generate | occur | produced by a coil part can be generated uniformly and over a wide range, and the vacuum valve excellent in the shutoff performance can be obtained. At the same time, since the magnetic material is not disposed inside the electrode, a rise in temperature during current supply can be avoided, and a vacuum valve having excellent current supply performance can be obtained.

FIG. 2 is a vertical sectional view of the vacuum valve according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view of the vacuum valve according to Embodiment 1 of the present invention. FIG. 2 is a schematic diagram illustrating a magnetic field of the vacuum valve according to the first embodiment of the present invention. FIG. 2 is an exploded perspective view illustrating an electrode configuration according to the first embodiment of the present invention. FIG. 3 is a plan view and a cross-sectional view of the fixed-side coil electrode according to Embodiment 1 of the present invention. FIG. 5 is a transverse sectional view of a vacuum valve according to a second embodiment of the present invention. FIG. 13 is a transverse sectional view of a vacuum valve according to Embodiment 3 of the present invention. FIG. 13 is a transverse sectional view of a vacuum valve according to Embodiment 4 of the present invention. It is a cross-sectional view of the vacuum valve according to Embodiment 5 of the present invention. FIG. 13 is a transverse sectional view of a vacuum valve according to Embodiment 6 of the present invention.

  In the description of the embodiments and the drawings, parts denoted by the same reference numerals indicate the same or corresponding parts.

Embodiment 1 FIG.
FIG. 1 is a longitudinal sectional view of a vacuum valve according to Embodiment 1 of the present invention, and FIG. 2 shows an arrangement of a fixed-side coil electrode, a movable-side coil electrode, and a magnetic body between an insulating container and an arc shield. 1 shows a cross-sectional view of a vacuum valve according to Embodiment 1. FIG. FIG. 3 is a schematic diagram showing a magnetic field when the vacuum valve according to Embodiment 1 of the present invention is energized. FIG. 4 is an exploded perspective view showing the structure of the electrode of the present invention, and FIG. 5 is a plan view and a sectional view showing the shape of the fixed coil electrode of the present invention.

  As shown in FIG. 1, the upper end opening of the insulating cylinder 1 is covered with the fixed end plate 2, and the lower end opening is covered with the movable end plate 3. The insulating cylinder 1 is made of an insulating material, and in this embodiment, alumina ceramics is used. The fixed-side end plate 2 and the movable-side end plate 3 are respectively joined to the end surfaces of the insulating cylinder 1 by brazing.

  A fixed electrode rod 4 is joined to the fixed end plate 2 by brazing, and a fixed electrode 10 is joined to the fixed electrode rod 4 by brazing. On the other hand, the movable electrode 5 is attached to the movable end plate 3 in a movable state, and the movable electrode 20 is joined to the movable electrode 5 by brazing.

  A bellows 6 having a bellows shape is arranged between the movable end plate 3 and the movable electrode bar 5 so that the movable electrode bar 5 can be operated while maintaining the vacuum in the vacuum valve. The bellows 6 uses a thin metal plate or the like. In the present embodiment, a thin stainless steel plate is used. A bellows cover 7 is fixed to the upper end of the bellows 6 by brazing to the movable electrode bar 5.

    The fixed-side electrode 10 includes a fixed-side coil electrode 12 and a disk-shaped fixed-side contact 11, and the movable-side electrode 20 includes a movable-side coil electrode 22 and a movable-side contact 21. At the time of current interruption, an arc is generated between the fixed contact 11 of the fixed electrode 10 and the movable contact 21 of the movable electrode 20, and the inside of the insulating cylinder 1 is contaminated by metal vapor. In order to suppress the contamination by the metal vapor, the arc shield 8 is arranged so as to surround the fixed side electrode 10 and the movable side electrode 20. Further, on the outer surface of the arc shield 8, a magnetic body 9 for uniformly diffusing the arc of the present invention is arranged. The material of the magnetic body 9 can be used as long as it is a normal magnetic body, and is not particularly limited. In the present embodiment, the magnetic body 9 is made using an iron-based alloy.

  Next, the structure of the fixed electrode 10 and the movable electrode 20 will be described with reference to FIGS. FIG. 2 is a cross-sectional view of the vacuum valve as described above, and shows a state in which both electrodes 10 and 20 are observed from above (the side of the fixed end plate 2). Therefore, the lower surface of the fixed side electrode 10, the movable side electrode 20 located below the fixed side electrode 10, and the like cannot be directly observed. In this manner, the parts that cannot be directly viewed are indicated by parentheses in the figure.

  FIG. 3 is a vertical cross-sectional view of both electrodes 10 and 20, and schematically shows the state of a magnetic field generated between the fixed-side coil electrode 12 and the movable-side coil electrode 22 by arrows. FIG. 4 is an exploded perspective view showing the electrode structure of the present invention, and shows the structure of the fixed-side electrode 10 and the movable-side electrode 20, and FIG. 5 explains the shape of the fixed-side coil electrode 12 in detail. (a) is a plan view and (b) is a cross-sectional view of the AA portion.

  As shown in FIGS. 2 and 3, the fixed-side electrode 10 and the movable-side electrode 20 are disposed with the fixed-side contact 11 and the movable-side contact 21 facing each other. 12 and the movable side coil electrode 22 are arranged. The fixed-side contact 11 is mechanically supported by the fixed-side electrode bar 4 via the fixed-side support member 18, and the movable-side contact 21 is mechanically supported by the movable-side electrode bar 5 via the movable-side support member 28. I have. The fixed contact 11 and the movable contact 21 are preferably formed using a silver-based alloy or a copper-based alloy, and the fixed-side coil electrode 12 and the movable-side coil electrode 22 are formed using copper or a copper-based material. Preferably, it is formed. In the present embodiment, the fixed-side contact 11, the movable-side contact 21, the fixed-side coil electrode 12, and the movable-side coil electrode 22 are all made of a copper alloy. Further, the fixed-side support member 18 and the movable-side support member 28 are required to have sufficient strength, and stainless steel is used in the present embodiment.

  As shown in FIG. 2, in the present embodiment, the fixed-side slit 17, which is a gap between the fixed-side coil 15 formed in the fixed-side coil electrode 12 of the fixed-side electrode 10, and the movable side electrode 20 The movable side slit portion 27 formed in the side coil electrode 22 is set so as to overlap with the movable side slit portion 27 when viewed from above the vacuum vessel (the side of the fixed side end plate 2). The manner in which the fixed-side electrode 10 and the movable-side electrode 20 overlap is not limited to the arrangement in which the positions of the respective slit portions 17 and 27 overlap, and similar effects can be obtained in other overlapping manners. .

  In a state where the electrodes are in contact with each other and a current flows between the fixed-side electrode 10 and the movable-side electrode 20, the fixed-side electrode rod 4 and the movable-side electrode 20 are arranged as shown by arrows in FIG. A magnetic field is generated in a direction along the axis of the rod 5. The arc generated between the electrodes by this magnetic field can be dispersed.

  FIG. 5 illustrates the structure of the coil electrode using the fixed-side coil electrode 12 as an example. The movable side coil electrode 22 also has basically the same shape as the fixed side coil electrode 12. The fixed-side coil electrode 12 has a fixed-side ring portion 13 connected to the fixed-side electrode rod 4 at the center portion, and a plurality of fixed-side coil electrodes 12 extending at substantially equal intervals from the fixed-side ring portion 13 toward the outer periphery. (Three in the figure). Further, the distal end portion of the fixed-side arm portion 14 is bent in the circumferential direction to form an arc-shaped fixed-side coil portion 15. The fixed side coil section 15 is formed corresponding to the fixed side arm section 14, and has a fixed side slit section 17 between the fixed side coil sections 15.

  The distal end portion of the fixed-side coil portion 15 connected to the fixed-side arm portion 14 is a protruding portion for electrically connecting the fixed-side coil electrode 12 and the adjacent fixed-side contact 11. A fixed-side protrusion 16 is formed. The fixed side protruding portion 16 is formed by protruding an appropriate length in the axial direction from the distal end portion of the fixed side coil portion 15 to be fixed to the fixed side contact 11 by brazing.

  The fixed-side coil portion 15 is arranged on a concentric circle on the outer peripheral side of the fixed-side ring portion 13 and is equally divided (three in the present embodiment) and arranged on the circumference. When a current flows through the fixed coil portion 15, a magnetic field can be generated.

  The direction of the current when the fixed contact 11 and the movable contact 21 are connected and a current flows between the fixed electrode 4 and the movable electrode 5 is indicated by an arrow in FIG. The current flows from the fixed electrode rod 4 to the movable electrode rod 5.

  The current flowing from the fixed-side electrode rod 4 is diverted from the fixed-side ring portion 13 of the fixed-side coil electrode 12 to the fixed-side arm portion 14, passes through the fixed-side coil portion 15, and the fixed-side protrusion 16, and passes through the fixed-side contact 11. Flows to Further, the current flows from the movable contact 21 to the movable coil electrode 22 via an arc generated between the fixed electrode 10 and the movable electrode 20, and the movable projection 26 and the movable coil part of the movable coil electrode 22. 25, they merge via the movable arm 24 and flow to the movable electrode rod 5. At this time, a magnetic field is generated by the current flowing through the fixed side coil electrode 12 and the movable side coil electrode 22.

  In the present embodiment, as described above, the fixed-side slit portion 17 of the fixed-side coil electrode 12 and the movable-side slit portion 27 of the movable-side coil electrode 22 are arranged so as to overlap with each other, as shown in FIG. The fixed arm 14 of the fixed coil electrode 12, the movable projection 26 of the movable coil electrode 22, the fixed projection 16 of the fixed coil electrode 12 and the movable arm 24 of the movable coil electrode 22 overlap. The fixed-side coil portion 15 of the fixed-side coil electrode 12 and the movable-side coil portion 25 of the movable-side coil electrode 22 are disposed so as to overlap with each other.

  As can be seen from the direction of the current shown in FIG. 4, a strong axial magnetic field is generated in the overlapping fixed-side coil portion 15 and movable-side coil portion 25 because current flows in the same direction. At the portion where the fixed arm 14 and the movable arm 26 overlap, and where the fixed arm 16 and the movable arm 24 overlap, the current of the circumferential component that generates the magnetic field in the axial direction is small, and the magnetic field is weakened as it is. .

  In the present embodiment, as shown in FIG. 2 and the like, a magnetic body 9 is provided between the arc shield 8 and the insulating cylinder 1. The magnetic body 9 is a plate having a uniform thickness and has a curved shape along the curved surface of the arc shield 8. In a position corresponding to a portion where the current in the circumferential direction is small and a magnetic field is hardly generated in the axial direction, such as a portion where the projecting portions 16 and 26 of the fixed side electrode 10 and the movable side electrode 20 and the arm portions 14 and 24 overlap. The magnetic body 9 is attached.

  In the present embodiment, the fixed-side arm 14 of the fixed-side coil electrode 12 and the movable-side protrusion 26 of the movable-side coil electrode 22, and the fixed-side protrusion 16 of the fixed-side coil electrode 12 and the movable side of the movable-side coil electrode 22 are movable. The magnetic field in the axial direction is hardly generated in the portion where the side arm 24 overlaps, and the insulating cylinder 1 and the arc shield 8 on the extension of the line connecting the axis center of the fixed electrode 10 and the movable electrode 20 with the hardly generated magnetic field. The magnetic body 9 is disposed between them.

  The arrangement of the magnetic body 9 can enhance the magnetic field in a portion where the magnetic field is unlikely to be generated, makes it possible to make the magnetic field distribution in the axial direction uniform, and expands the area where the arc is diffused in the current breaker, thereby cutting off the current. Performance is improved.

  When the positioning of the fixed-side coil electrode 12 and the movable-side coil electrode 22 is determined by the overlapping of the fixed-side slit portion 17 and the movable-side slit portion 27, the width WF of the magnetic body 9 is determined by a magnetic field analysis. As shown in FIG. 2, when WC ≦ WF ≦ (2 × WC + WS) × RF / RC using the inner radius RF of the magnetic material, the radius RC of the coil, the width WC of the coil protrusion, and the width WS of the slit portion, In other words, the ratio of the radius to the sum of twice the width WC of the coil protrusion and the width WS of the slit, which is the width of the region where the magnetic field is weakened, is set so that the width WF of the magnetic body 9 is equal to or larger than the width WC of the coil protrusion. , The magnetic field distribution can be made particularly uniform.

  By using the structure described in the first embodiment, the magnetic body 9 can be arranged inside the electrode and the magnetic field can be made uniform without a rise in temperature when energized. Vacuum valve can be obtained.

Embodiment 2 FIG.
FIG. 6 shows a cross-sectional view of the vacuum valve according to the present embodiment. In FIG. 6, similarly to FIG. 2, since the fixed side electrode 10 and the movable side electrode 20 are observed from above (the side of the fixed side end plate 2), the lower surface of the fixed side electrode 10 and the fixed side electrode 10 The movable-side electrode 20 and the like located underneath cannot be directly observed. In this manner, the parts that cannot be directly viewed are indicated by parentheses in the figure.

  The basic configuration of the vacuum valve according to the present embodiment is the same as that of the vacuum valve according to the first embodiment. In the vacuum valve according to the first embodiment, the fixed-side coil electrode 12 and the movable-side coil electrode 22 are respectively provided. In contrast to the three fixed-side coil portions 15 and the movable-side coil portion 25, which are arranged so that the fixed-side slit portion 17 and the movable-side slit portion 27 overlap each other, in the present embodiment, The difference is that the coil portion 15 and the movable side coil portion 25 are divided into four, and the fixed side projecting portion 16 and the movable side projecting portion 26 are arranged so as to overlap.

  Even in the case where the fixed-side coil electrode 12 and the movable-side coil electrode 22 are positioned so that their respective protruding portions overlap, in the portion where the fixed-side coil part 15 and the movable-side coil part 25 overlap, the fixed-side electrode 10, When a current flows between the movable electrodes 20, a strong magnetic field can be generated in the axial direction because the current flows in the same circumferential direction. However, the portion where the fixed-side protrusion 16 and the movable-side protrusion 26 overlap with each other. In the vicinity, the current in the circumferential direction is small, and the generated magnetic field is also weak.

  The magnetic body 9 is arranged on an extension line connecting a portion where the fixed-side protrusion 16 and the movable-side protrusion 26 overlap from the center of the electrode axis and between the insulating cylinder 1 and the arc shield 8. The magnetic body 9 has a plate shape having a uniform thickness as in the first embodiment and has a shape curved along the curved surface of the arc shield 8, and in the present embodiment, an iron-cobalt alloy is used. Due to the arrangement of the magnetic body 9, the magnetic field near the portion where the fixed side protrusion 16 and the movable side protrusion 26 overlap is strengthened, the magnetic field distribution can be made uniform, and the area where the arc is diffused when current is interrupted can be enlarged. Therefore, the cutoff characteristics can be improved.

  When the fixed-side electrode 10 and the movable-side electrode 20 are arranged so that the fixed-side protrusion 16 and the movable-side protrusion 26 overlap, the width WF of the magnetic body 9 is RF, the inner radius of the magnetic body 9 is RF, and the protrusion is When the width is WC, the width of the arm is WA, the width of the slit is WS, and the radius of the coil is RC, when WC ≦ WF ≦ (2 × WA + WC + 2 × WS) × RF / RC, that is, The width WF is equal to or larger than the width WC of the coil protrusion, and the width of the region where the magnetic field is weakened is the sum of twice the width WA of the arm, the width WC of the coil protrusion, and twice the width WS of the slit. It has been found from magnetic field analysis that the magnetic field distribution can be made particularly uniform when the value is less than or equal to the value obtained by multiplying by the ratio of the radius.

  In the structure of the vacuum valve shown in the present embodiment, since the magnetic body 9 is not disposed inside the electrode, the magnetic field can be made uniform without being adversely affected by a rise in temperature when current is applied, and the size is reduced, and the cutoff performance is improved. An excellent vacuum valve can be obtained.

Embodiment 3 FIG.
FIG. 7 shows a cross-sectional view of the vacuum valve according to the present embodiment. In FIG. 7, similarly to FIG. 2, since the fixed side electrode 10 and the movable side electrode 20 are observed from above (the side of the fixed side end plate 2), the lower surface of the fixed side electrode 10 and the fixed side electrode 10 The movable-side electrode 20 and the like located underneath cannot be directly observed. In this manner, the parts that cannot be directly viewed are indicated by parentheses in the figure.

  The basic configuration of the vacuum valve according to the present embodiment is the same as that of the vacuum valve according to the first embodiment, and includes a fixed-side coil unit 15 constituting the fixed-side electrode 10 and a movable side constituting the movable-side electrode 20. Each of the coil portions 25 is divided into three, and is arranged so as to overlap. In the present embodiment, the configuration of the three magnetic members disposed between the insulating cylinder 1 and the arc shield 8 is correspondingly different.

  In this embodiment and the following embodiments, basically, the shapes and arrangements of the fixed electrode 10 and the movable electrode 20 are the same as those of the first embodiment. However, the present invention is not limited to this. As shown in Embodiment 2, the shapes and arrangements of the fixed side electrode 10 and the movable side electrode 20 can be divided into four parts of the coil parts 15 and 25 so that the projecting parts 16 and 26 overlap each other. Other configurations are also possible. However, when the shapes and arrangements of the fixed side electrode 10 and the movable side electrode 20 are changed, it may be necessary to change other configurations such as the magnetic body 9 at the same time.

  In the first embodiment, the magnetic body 9 is made of an iron-based alloy, has a plate shape having a uniform thickness, and has a shape curved along the shape of the arc shield 8. In the present embodiment, the magnetic material 9c is made of two types of magnetic materials, and the magnetic material constituting the magnetic material 9a located at both ends in the circumferential direction and the magnetic material forming the magnetic material 9b located at the central portion are different. ing. Specifically, the magnetic bodies 9a at both ends in the circumferential direction of the magnetic body 9c are made of iron, and the magnetic body 9b at the center is made of an iron-cobalt alloy having a higher magnetic permeability than pure iron.

  In the present embodiment, the positional relationship between the fixed-side electrode 10 and the movable-side electrode 20 is the same as in the first embodiment, and the slits 17 and 27 are arranged so as to match. At this time, the arm 14 of the fixed-side coil electrode 12 and the protrusion 26 of the movable-side coil electrode 22 overlap, and the protrusion 16 of the fixed-side coil electrode 12 and the arm 24 of the movable-side coil electrode 22 overlap. In these portions, the current in the circumferential direction is small, and the generated magnetic field is also weak.

  When the low magnetic field portion is examined in detail, the magnetic field is weakest at the center portion and slightly strong at the peripheral portion. The magnetic material 9c used in the present embodiment uses a magnetic material having a low magnetic permeability at both ends and a magnetic material having a high magnetic permeability at the central portion. The effect of strengthening the magnetic field is relatively small in the area where the magnetic field is greatly increased and the surrounding magnetic field is slightly lower, so that the distribution of the magnetic field can be made more uniform, and a compact vacuum valve with excellent shut-off characteristics can be obtained. it can.

  In the present embodiment, the magnetic bodies 9a at both ends have a width of １ ／ of the entire magnetic body 9c, and the magnetic body 9b at the center has three widths of １ ／ of the whole magnetic body 9c. Although the division is made, the invention is not limited to this, and the division ratio can be freely set. However, it is important to use a magnetic material having low magnetic permeability at both ends and a magnetic material having high magnetic permeability at the center.

  In the structure of the vacuum valve shown in the present embodiment, since the magnetic body 9 is not disposed inside the electrode, there is no reduction in reliability due to a rise in temperature when current is applied, the magnetic field can be made uniform, and the size and the breaking performance can be reduced. It is possible to obtain an excellent vacuum valve.

Embodiment 4 FIG.
FIG. 8 shows a cross-sectional view of the vacuum valve according to the present embodiment. In FIG. 8, similarly to FIG. 2, since the fixed-side electrode 10 and the movable-side electrode 20 are observed from above (the side of the fixed-side end plate 2), the lower surface of the fixed-side electrode 10 and the fixed-side electrode 10 The movable-side electrode 20 and the like located underneath cannot be directly observed. In this manner, the parts that cannot be directly viewed are indicated by parentheses in the figure.

  The basic configuration of the vacuum valve according to the present embodiment is the same as that of the vacuum valve according to the first embodiment, and includes a fixed-side coil unit 15 constituting the fixed-side electrode 10 and a movable side constituting the movable-side electrode 20. Each of the coil portions 25 is divided into three. These configurations are examples as described above, and other configurations can be used.

  In the present embodiment, the shapes of three magnetic bodies disposed between the insulating cylinder 1 and the arc shield 8 are different. In the first embodiment, a plate-like iron-based alloy having a uniform thickness is used, and the magnetic body 9 that is curved in accordance with the shape of the arc shield 8 is used. The present embodiment is the same as the first embodiment in that an iron-based alloy is used and a magnetic body 9d curved in accordance with the shape of the arc shield 8 is used, but the thickness of the magnetic body 9d is not uniform. The difference is that both ends in the circumferential direction are thin and the center part is thick.

  The portion where the magnetic field generated when the current flows between the electrodes is weakest at the central portion, and is slightly stronger around the central portion than at the central portion. On the other hand, the shape of the magnetic body 9d is thick at the center and thin at both ends in the circumferential direction. Since the thinner portion is more likely to cause magnetic saturation and has less effect of strengthening the magnetic field, the magnetic material 9d corresponding to the central portion where the magnetic field is weakest is thicker and has a greater effect of strengthening the magnetic field. Since the effect of strengthening the magnetic field is weakened, the magnetic field distribution when the magnetic body 9 is not used is supplemented, the magnetic field distribution can be made more uniform, and a small-sized vacuum valve having excellent shut-off characteristics can be obtained.

  In the structure of the vacuum valve shown in the present embodiment, since the magnetic body 9 is not disposed inside the electrode, the magnetic field can be made uniform without being adversely affected by a rise in temperature when current is applied, and the size is reduced, and the cutoff performance is improved. An excellent vacuum valve can be obtained.

Embodiment 5 FIG.
FIG. 9 shows a cross-sectional view of the vacuum valve according to the present embodiment. Also in FIG. 9, as in FIG. 2 and the like, observation is made from the upper side (the side of the fixed-side end plate 2).

  The basic configuration of the vacuum valve according to the present embodiment is the same as that of the vacuum valve according to the first embodiment, and the fixed coil portion 15 that forms the fixed electrode 10 and the movable coil that forms the movable electrode 20. The parts 25 are respectively arranged in three places. These arrangements are merely examples, and configurations different from these can also be used.

  The present embodiment is different from the first embodiment in that each magnetic body 9h has a bar shape extending in the vertical direction (axial direction). In the first embodiment, the magnetic body 9 is made of an iron-based alloy, has a plate shape with a uniform thickness, and has a shape that is curved along the shape of the arc shield 8. In the present embodiment, the magnetic body 9h is divided into five rod-like members extending in the up-down direction (axial direction), two magnetic bodies 9g at both ends, two magnetic bodies 9f at an intermediate position, and a central portion. It is composed of two magnetic bodies 9e.

  The cross-sectional area of the five magnetic bodies 9h has a relation of the surrounding magnetic bodies 9g <the magnetic body 9h at the intermediate position <the magnetic body 9e at the central part, and the mounting interval of each magnetic body is also from the central part to both ends. It is configured to be wider. With such a configuration of the magnetic body 9h, when viewed in the left-right direction (circumferential direction), the magnetic body 9 has a larger cross-sectional area at the center than at both ends, and the center of the magnetic body 9 is larger than both ends. The effect of strengthening the magnetic field is great.

  In the present embodiment, the positional relationship between the fixed-side electrode 10 and the movable-side electrode 20 is the same as in the first embodiment, and the slits 17 and 27 are arranged so as to coincide with each other. In the portion around the slits 17 and 27, the current in the circumferential direction is small, and the generated magnetic field is also weak. More specifically, the magnetic field is weakest at the center and slightly stronger at both ends.

  If the magnetic material 9h divided into five portions used in the present embodiment is used in the portion where the magnetic field is weakened, the effect of strengthening the magnetic field is large at the center portion and the effect of strengthening the magnetic field at both ends is small, so that the distribution of the magnetic field is reduced. It is possible to obtain a vacuum valve which can be made uniform, small and excellent in shut-off characteristics.

  In the present embodiment, the magnetic body 9h is divided into five parts, and the magnetic body in the both ends direction (circumferential direction) is narrower and the installation interval is widened. However, the width and the installation interval of the magnetic body are not particularly limited. The cross-sectional area of the magnetic body may be wide at the center and narrow at both ends.

    In the structure of the vacuum valve shown in the present embodiment, no magnetic material is arranged inside the electrode, so that the magnetic field can be made uniform without being adversely affected by a temperature rise when current is supplied, and the size is excellent and the breaking performance is excellent. Vacuum valve can be obtained.

Embodiment 6
FIG. 10 shows a cross-sectional view of the vacuum valve according to the present embodiment. Also, in FIG. 10, as in FIG. 2 and the like, the part is observed from the upper side (the side of the fixed end plate 2), and the parts that cannot be directly viewed are indicated by parentheses in the figure.

  The basic configuration of the vacuum valve according to the present embodiment is the same as that of the vacuum valve described in the first embodiment, and includes a fixed-side coil unit 15 forming the fixed-side electrode 10 and a movable-side coil forming the movable-side electrode 20. The parts 25 are respectively divided into three parts and arranged so as to overlap. As described above, this configuration is an example, and a different configuration can be used.

  For example, in the first embodiment, the magnetic body is arranged at a position corresponding to a portion where the magnetic field generated by the fixed electrode 10 and the movable electrode 20 is weakened. Specifically, in the first embodiment, the fixed-side slit 17 of the fixed-side electrode 10 and the movable-side slit 27 of the movable-side electrode 20 are arranged so as to overlap with each other. . Therefore, the magnetic body 9 is arranged at a position corresponding to this portion.

In the present embodiment, the arc shield 8 itself is formed of a magnetic material to form a magnetic body (also serving as an arc shield) 9j, and the portion where the magnetic body 9 is arranged in the first embodiment, that is, the fixed-side electrode the magnetic field weak portion caused by the 10 and the movable electrode 20, the magnetic body by increasing the thickness of the magnetic body 9 j (thick portions) to form a 9 i.

In the present embodiment, the magnetic body (also serving as an arc shield) 9j is formed using an iron-based alloy including the magnetic body (thick portion) 9i . Basically, the magnetic permeability so thin portion of the magnetic material (and arc shield) 9 j is also formed in the same material as the magnetic material (thick portion) 9 i is the same, the effect of strong magnetic field the same the case, the magnetic material (thick portion) in 9 i compared to the thin portion, the magnetic saturation hardly occurs as described in the fourth embodiment, the effect is large to strengthen the electric field. Therefore, the distribution of the magnetic field can be made uniform, and a small-sized vacuum valve having excellent shut-off characteristics can be obtained.

  In the structure of the vacuum valve shown in the present embodiment, no magnetic material is arranged inside the electrode, so that the magnetic field can be made uniform without being adversely affected by a temperature rise when current is supplied, and the size is excellent and the breaking performance is excellent. Vacuum valve can be obtained.

DESCRIPTION OF SYMBOLS 1 Insulated cylinder, 2 fixed end plate, 3 movable end plate, 4 fixed electrode rod, 5 movable electrode rod, 6 bellows, 7 bellows cover, 8 arc shield, 9 magnetic body, 9a, b, c, d , E, f, g, h, i, j, k, m Magnetic material, 10 fixed side electrode, 11 fixed side contact, 12 fixed side coil electrode, 13 fixed side ring, 14 fixed side arm, 15 fixed side Coil part, 16 fixed side protrusion, 17 fixed side slit part, 18 fixed side support material, 20 movable side electrode, 21 movable side contact, 22 movable side coil electrode, 23 movable side ring part, 24 movable side arm part, 25 Movable coil, 26 Movable protrusion, 27 Movable slit, 28 Movable support, RF magnetic material radius, WF magnetic material width, RC coil radius, WC protrusion width, WA arm width. WS Slit width.

Claims (12)

A vacuum vessel covering one end of the cylindrical insulating cylinder with a fixed end plate and the other end with a movable end plate,
A fixed electrode rod fixed to the fixed end plate,
A movable electrode rod provided on the movable end plate so as to be able to advance and retreat,
A fixed-side electrode and a movable-side electrode attached to opposite ends of the fixed-side electrode rod and the movable-side electrode rod,
An arc shield disposed around the fixed side electrode and the movable side electrode inside the vacuum vessel,
The fixed side electrode and the movable side electrode, a fixed side contact facing each other, a movable side contact,
When a current flows between the fixed-side electrode rod and the movable-side electrode rod, the current flows in a circumferential direction perpendicular to the axis of the electrode rod when the current flows between the fixed-side electrode rod and the movable-side electrode rod. It has a fixed-side coil electrode and a movable-side coil electrode,
The fixed-side coil electrode and the movable-side coil electrode are located at a central portion, the fixed-side electrode rod, a fixed-side ring portion respectively connected to the movable-side electrode rod, a movable-side ring portion,
The fixed side ring portion, the concentric fixed side coil portion which is located in a plane orthogonal to the axis of the movable side ring portion and is divided into a plurality of pieces in the circumferential direction by the fixed side slit portion and the movable side slit portion, respectively. , The movable side coil part,
The fixed-side ring portion, the movable-side ring portion extends in a direction perpendicular to the axis, and the fixed-side ring portion and one end of the fixed-side coil portion, the movable-side ring portion and one end of the movable-side coil portion A plurality of fixed-side arm units and a movable-side arm unit to be connected to each other,
A vacuum valve having
The fixed-side coil electrode and the movable-side coil electrode are provided with a magnetic body between the arc shield and the vacuum vessel, respectively corresponding to the plurality of divided positions in the circumferential direction of the movable-side coil electrode ,
The magnetic body corrects an axial magnetic field generated by a current flowing through the fixed-side coil electrode and the movable-side coil electrode, and generates the magnetic field as compared with the fixed-side coil unit and the movable-side coil unit. A vacuum valve, which is arranged so as to further increase the correction amount for a magnetic field at a position divided into a plurality of parts in the circumferential direction, which is a difficult part .   The vacuum valve according to claim 1, wherein the number of divisions of the fixed side coil electrode and the movable side coil electrode is the same as the number of the magnetic bodies. The fixed-side electrode and the movable-side electrode are disposed so as to overlap with the position of the fixed-side slit and the position of the movable-side slit, respectively.
The vacuum valve according to claim 1, wherein the magnetic body is disposed on an extension of a line connecting the axis and the slits. 4. A fixed-side protruding portion that protrudes in the axial direction from the other end of the fixed-side coil portion to which the fixed-side coil portion is connected to the one end and that is electrically connected to the fixed-side contact; And movable from the other end of the movable coil portion opposite to the one end to which the movable arm portion is connected, in the axial direction to the movable contact, and electrically connected to the movable contact. With side protrusions,
The width of the magnetic body is WF, the distance of the magnetic body from the axis is RF, the width of the fixed side protruding portion and the width of the movable side protruding portion are WC, the width of the fixed side slit portion and the movable side slit are When the width of the portion is WS and the inner radius of the fixed-side coil electrode and the inner radius of the movable-side coil electrode are RC, the width WF of the magnetic body is WC ≦ WF ≦ (2 × WC + WS) × RF The vacuum valve according to claim 3, wherein a relationship of / RC is satisfied. A fixed-side protruding portion that protrudes in the axial direction from the other end of the fixed-side coil portion to which the fixed-side coil portion is connected to the one end and that is electrically connected to the fixed-side contact; And movable from the other end of the movable coil portion opposite to the one end to which the movable arm portion is connected, in the axial direction to the movable contact, and electrically connected to the movable contact. With side protrusions,
The fixed-side electrode and the movable-side electrode are disposed so as to overlap with the position of the fixed-side protrusion and the position of the movable-side protrusion, respectively.
The vacuum valve according to claim 1, wherein the magnetic body is disposed on an extension of a line connecting the axis and the two protruding portions. The width of the magnetic body is WF, the distance of the magnetic body from the axis is RF, the width of the fixed-side protrusion and the width of the movable-side protrusion are WC, the width of the fixed-side arm and the width of the movable-side arm. When the width of the portion is WA, the width of the fixed slit portion and the width of the movable slit portion are WS, and the inner radius of the fixed coil electrode and the inner radius of the movable coil electrode are RC. 6. The vacuum valve according to claim 5, wherein the width WF of the magnetic material satisfies a relationship of WC ≦ WF ≦ (2 × WA + WC + 2 × WS) × RF / RC.   7. The magnetic material according to claim 1, wherein the magnetic material is composed of a plurality of regions formed in a circumferential direction perpendicular to the axis, and each of the regions is composed of two or more types of regions having different magnetic material. The vacuum valve according to any one of the preceding claims.   The magnetic material according to claim 7, wherein the magnetic material is formed of a plurality of regions formed in a circumferential direction orthogonal to the axis, and the magnetic material having a higher magnetic permeability as the region at both ends is formed. Vacuum valve.   7. The magnetic material according to claim 1, wherein the thickness of the magnetic material changes in a circumferential direction orthogonal to the axis, and the magnetic material is formed to be thinner at both end regions and thicker at the center. Vacuum valve.   The magnetic material is divided into a plurality of regions in a circumferential direction orthogonal to the axis, and the magnetic material is arranged so as to have a smaller cross-sectional area at both ends and with a gap therebetween. The vacuum valve according to any one of the preceding claims. The magnetic body and the arc shield are integrally formed of the same material, and the fixed-side coil electrode and the movable-side coil electrode correspond to the plurality of divided positions in the circumferential direction of the magnetic body. The vacuum valve according to any one of claims 1 to 6, wherein the thickness is increased .   The magnetic body and the arc shield are integrally formed of the same material, the magnetic body changes its thickness in a circumferential direction perpendicular to the axis, and is formed thinner in both end regions and thicker in a central portion. The vacuum valve according to claim 11, wherein:

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